यदा संहरते चायं कूर्मोऽंगानीव सर्वशः ।इन्द्रियाणीन्द्रियार्थेभ्यस् तस्य प्रज्ञा प्रतिष्ठिता ॥
yadā saṃharate cāyaṃ kūrmo’ṃgānīva sarvaśaḥindriyāṇīndriyārthebhyas tasya prajñā pratiṣṭhitā
Who draws away the senses from the objects of sense, as the tortoise draws in his limbs into the shell, his intelligence sits firmly founded in wisdom.
Gītā 2·58We must draw them back when they are inclined thus to rush out, draw them away from their objects,—as the tortoise draws in his limbs into the shell, so these into their source, quiescent in the mind, the mind quiescent in intelligence, the intelligence quiescent in the soul and its self-knowledge, observing the action of Nature, but not subject to it, not desiring anything that the objective life can give.